BSS Audio DPR 404 Bedienungsanleitung

DPR 404

User Manual

This equipment has been tested and found to comply with the following European Standards for

Electromagnetic Compatibility:

Emission Specification: EN55013 (1990) (Associated equipment)

Immunity Specification: EN50082/1 (1992) (RF Immunity, Fast Transients and ESD)

Mains Disturbance: EN61000/3/2 (1995)

For continued compliance ensure that all input and output cables are wired with cable screen connected to Pin

1 of the XLR. The input XLR Pin 1 on BSS equipment is generally connected to chassis via a capacitor to

prevent ground loops whilst ensuring good EMC compatibility.

V3.0 JMK 26 July 1999

We have written this manual with the aim of helping installers, sound engineers and musicians alike get to

grips with the DPR-404 and obtain its maximum capability.

If you are new to BSS products, we recommend that you begin at the start of the manual. If, however, you are

already familiar with the intended application, and just want to get the unit installed without delay, then

follow the highlighted sections.

We welcome any comments or questions regarding the DPR-404 or other BSS products, and you may contact

us at the address or World Wide Web site given in the warranty section.

Contents

1.0 The BSS DPR-404 5

2.0 Unpacking 6

3.0 Mechanical Installation 6

4.0 Earthing Requirements 7

5.0 Mains Power Connection 8

7.0 Audio connections 12

7.1 Balanced wiring 12

7.2 Unbalanced wiring 12

7.3 Ground loop control 12

7.4 Linked operation 13

8.0 Controls 14

8.1 IN 14

8.2 Gain 14

8.3 Ratio 14

8.4 Attack/Release 14

8.5 Below TH meter 14

8.6 Gain reduction meter 14

8.7 De-ess 14

8.8 FREQ 14

8.9 Link 15

8.10 Link master LED 15

8.11 Main power fuse 15

9.0 Rear panel controls 16

9.1 Mains voltage selector switch 16

9.2 Mains power switch 16

9.3 Mains voltage selector switch 16

9.4 External side chain insert 16

9.5 Electronically balanced input 16

9.6 Electronically balanced and floating output 16

10.0 Compressors and Limiters 17

10.1 The need for Gain Control 17

10.2 Compressors and Limiters 18

Contents

11.0 The effect of Compression on

sound 20

11.1 Compression 20

11.2 Attack, Release and Ratio 21

11.3 De-essing 22

12.0 Specifications 23

13.0 Service Section 25

13.1 Transient suppressor replacement 25

13.2 Separating signal and chassis ground 26

14.0 Warranty Information 27

1.0 The BSS DPR-404

The DPR-404 is a compact and professional four channel compressor and de-

esser. Based on the well established BSS subtractive gain reduction principle,

it offers you four independent channels of high quality, musical compression

and high frequency de-essing, with the minimum of operator controls.

Designed to be quick and easy to operate by both skilled and novice

engineers alike, it makes a compact economical alternative to the fully

featured DPR-402 model.

The DPR-404 is the natural complement to the well established DPR-402 unit

and will find many applications within professional audio where ease of

operation is considered important along with lower cost without sacrifice to

quality and musicality. Some of the important features to be found on each

channel of the DPR-404 are:

• 30dB of gain reduction using BSS proprietary subtractive approach.

• Fully adjustable soft knee ratio up to 20:1 hard limit.

• Automatic adjustment of time constants with two user definable ranges.

• Output gain adjustment control with LED clip indicator. BSS proprietary

activity meter showing below threshold signal level, gain reduction and

usable range.

• Bypass in/out switching with LED indicator. Independent high frequency de-

esser threshold control and tuneable filter allows selective de-essing

simultaneously with compression.

• Twin LEDs show de-ess activity.

• Link switching allows adjacent channels to be linked for accurate stereo

working.

• One DPR-404 can be selected to process two stereo channels, or one stereo

channel and two independent mono channels, or four independent mono

channels.

• Compressor side chain insert on rear panel 1/4" RTS jack.

•Electronically balanced inputs and outputs with optional transformer

balancing.

The DPR-404

As part of BSS’ system of quality control, this product is carefully checked

before packing, to ensure flawless appearance. After unpacking the unit,

please inspect for any physical damage and retain the shipping carton and all

relevant packing materials for use should the unit need returning. A packet of

spare fuses is supplied. Please keep them in a safe place.

In the event that damage has occurred, please notify your dealer

immediately, so that a written claim to cover the damages can be initiated.

See Section 14.

2.0 Unpacking

3.0 Mechanical Installation

A vertical rack space of 1U (1.75", 44.5mm) is required. If the unit is part of a

transportable system, you must support the unit at it’s rear by additional

bracing or shelving . Failure to do so will impair reliability and invalidate the

Warranty. Additional threaded M3 screw holes are provided on the rear sides

to assist in providing proper support. Adequate ventilation must be provided

for by allowing sufficient room around the sides and rear of the unit to allow

free circulation of air. Forced cooling is not required. The internal power

supply regulators are mounted on the case sides and use this as their heatsink.

After a period of time in an enclosure, the metal case will feel hot to the

touch, but this is quite normal and should not be a cause for alarm.

Fig 3.1 Unit dimensions.

Fig 3.2 Rack

dimensions.

Unpacking

Mechanical Installation

Earthing Requirements

4.0 Earthing Requirements

WARNING! THIS APPLIANCE MUST BE EARTHED.

IMPORTANT: The wires in the mains lead are colour coded in accordance

with the following code.

Green and Yellow......Earth

Blue......Neutral

Brown......Live

As the colours of the wires in the mains lead may not correspond with

the markings identifying the terminals in your plug, proceed as

follows.

!The wire which is coloured Green and Yellow or Green must be connected

to the terminal which is marked with the letter ‘E’ or by the Earth signal

or which is coloured Green and Yellow or Green.

"The wire which is coloured Blue must be connected to the terminal

labelled ‘N’ or coloured Black or Blue.

#The wire which is coloured Brown must be connected to the terminal

labelled ‘L’ or coloured Red or Brown.

Those units supplied to the North American market will have an integral

moulded 3 pin connector which is provided to satisfy required local standards.

The mains voltage selector switch provides a simple external adjustment to

allow operation on all international AC power standards. The allowable ranges

for the supply voltage are:

90VAC up to 132VAC on the 115V position and

190VAC up to 264VAC on the 230V position.

Outside these ranges the unit will not work satisfactorily, if at all. Voltages in

excess of the maximum will probably cause damage. Voltages below the

minimum will cause the power supplies to drop out of regulation, degrading

the performance of the system.

5.0 Mains Power Connection

Voltage: The DPR-404 operates on either 120 or 240 volt supplies. Use the

voltage selector switch to choose the required voltage setting. (See Figure

8.1).

Frequency: Both 60Hz and 50Hz are acceptable.

Fig 5.1 Mains fuse on

rear panel.

Grounding: The DPR-404 must always be connected to a 3-wire grounded

('earthed') AC outlet. The rack framework is assumed to be connected to the

same grounding circuit. The unit must NOT be operated unless the power

cables ground ('earth') wire is properly terminated - it is important for personal

safety, as well as for proper control over the system grounding.

AC Power Fusing: The incoming mains power is fused within the DPR-404 by

the fuse holder mounted on the rear panel. If it needs to be replaced it must

be properly rated as:

20mm T160mA for 240v AC

T250mA for 120v AC

It is most important for continued safety that this specification is adhered to,

and you will have found that spare fuses of this rating are supplied together

with your unit and manual. It is very unlikely that this fuse will fail during

normal use, and must be treated with some caution as to the cause, if it

should do so. One of the most likely reasons will be following the incorrect

setting of mains voltage switch on the rear panel. Another reason can be the

inadvertent connection of line to line rather than line to neutral phase

voltages when using a three phase power connection. In either case, the

internal transient suppressors (VDRs) can become damaged. If so, they’ll

consistently blow replacement fuses. You can be assured that they have

protected your unit from damage, that the cost of replacement is small and

that the VDR’s demise has saved the much higher cost of ‘blowing up’ an

entire unit. If blown, the VDRs will need removal to allow further use of your

unit.

If you believe this has happened, please refer to section 13.1 for the removal

and replacement procedure. They should be replaced as soon as possible to

ensure continued protection.

Mains Power connection

Power ON: This is indicated the green 'ON' LED located under the CH 'IN'

switches. If this LED is not lit when power is connected and the 'POWER'

switch is depressed, see section 16.

Getting to know the DPR-404

Fig 6.1 Front Panel

Fig 6.2 Rear Panel

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